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United States Patent | 6,126,831 |
Goldau ,   et al. | October 3, 2000 |
A device and method are described to determine the concentration of a substance in blood flowing through a blood chamber of a dialyzer during extra corporeal blood treatment. The flow rate of dialysate flowing through the dialysate chamber of the dialyzer is reduced to a value at which the concentration of the substance at the outlet of the dialysate chamber is essentially the same as the concentration of that same substance in the blood at the inlet of the blood chamber. The concentration measurement can be carried out without interrupting the flow of dialysate.
Inventors: | Goldau; Rainer (Werneck, DE); Kramer; Matthias (Oberursel, DE) |
Assignee: | Fresenius Medical Care Deutschland GmbH (Bad Homburg, DE) |
Appl. No.: | 133252 |
Filed: | August 13, 1998 |
Aug 13, 1997[DE] | 197 34 992 | |
Feb 19, 1998[DE] | 198 06 900 |
Current U.S. Class: | 210/646; 210/96.2; 210/321.65; 210/739; 210/929; 604/4.01 |
Intern'l Class: | B01D 061/34 |
Field of Search: | 210/85,87,94,96.2,138,321.65,321.69,321.71,416.1,646,647,739,746,929,637,745 604/4-6,4.01,5.01,6.01,6.09,6.15 |
4923613 | May., 1990 | Chevallet | 210/647. |
5110477 | May., 1992 | Howard et al. | 210/647. |
5744031 | Apr., 1998 | Bene | 210/646. |
5849179 | Dec., 1998 | Emerson et al. | 210/646. |
5938938 | Aug., 1999 | Bosetto et al. | 210/646. |
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WO 94/09351 | Apr., 1994 | WO. | |
WO 94/08641 | Apr., 1994 | WO. |
Sargent JA, Gothch FA: Principles and Biophysics of Dialysis , in: W. Drukker et al., eds Replacement of Renal Function by Dialysis, Nijhoff, The Hague 1983. pp 53-96. Nguyen Khoa Man et al., "Clinical Validation of a Predictive Modeling Equation for Sodium" Artificial Organs 9(2): (1985) Raven Press, New York. pp 150-154. |